A thoroughly unenjoyable book. The premise is fairly interesting (cryptic alien messages arriving on Earth suddenly stop one day) but is brought (very) low by painfully unbelievable plot advancement (lots of crazy "whoa, wait - what?" eureka moments), psycho-new-age mumbo-jumbo meets math nerdiness, all wrapped up in a ham-handed happy bow (spoiler: everything works out)! The least enjoyable aspect, however, was the unreadable characters...it was as if they were written by one of the aliens in the book (a "Centaur") - who had researched hum-man-be-ings from the "overmind" but had never actually witnessed one.