I've read a lot of books on the evidence for life after death, but of them all, the one I would most recommend as a general, nontechnical introduction is Greg Taylor's Stop Worrying! There Probably Is an Afterlife.
In the past, I sometimes toyed with the idea of writing a nonfiction book that would provide an overview of afterlife evidence. But when I read Stop Worrying, I realized Greg had already written the book I would have wanted to write – and he'd done it better than I could have.
There are many things I like about Stop Worrying – too many to list in a brief post. I like the structure – the way the book eases the reader into the evidence, moving smoothly from one topic to another (the segue from NDEs to mediumship is particularly effective). I like the choice of what to include and, even more so, what to omit; the book does not get bogged down in technical debates about super-psi or convoluted skeptical objections, and does not cover physical or materialization mediumship, areas that have historically been rife with fraud.
Above all, I like the book's tone – friendly, relaxed, reassuring, and undogmatic. Note the all-important word "probably" in the title – and the cover image of a smiley-face Grim Reaper.
Stop Worrying! There Probably Is an Afterlife is currently available in a Kindle edition, and I'm told a paperback is forthcoming within a week or so.
More info can be found at Greg's website, The Daily Grail.
Disclosure: I contributed a small amount of money to Greg's crowd-funding effort, and I received a free review copy of a late draft of the manuscript.